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/* $Id$ */
/** @file subsidy_base.h Subsidy base class. */
#ifndef SUBSIDY_BASE_H
#define SUBSIDY_BASE_H
#include "cargo_type.h"
#include "company_type.h"
/** Struct about subsidies, offered and awarded */
struct Subsidy {
CargoID cargo_type; ///< Cargo type involved in this subsidy, CT_INVALID for invalid subsidy
byte age; ///< Subsidy age; < 12 is unawarded, >= 12 is awarded
uint16 from; ///< Index of source. Either TownID, IndustryID or StationID, when awarded
uint16 to; ///< Index of destination. Either TownID, IndustryID or StationID, when awarded
/**
* Determines index of this subsidy
* @return index (in the Subsidy::array array)
*/
FORCEINLINE size_t Index() const
{
return this - Subsidy::array;
}
/**
* Tests for validity of this subsidy
* @return is this subsidy valid?
*/
FORCEINLINE bool IsValid() const
{
return this->cargo_type != CT_INVALID;
}
static Subsidy array[MAX_COMPANIES]; ///< Array holding all subsidies
/**
* Total number of subsidies, both valid and invalid
* @return length of Subsidy::array
*/
static FORCEINLINE size_t GetArraySize()
{
return lengthof(Subsidy::array);
}
/**
* Tests whether given index is an index of valid subsidy
* @param index index to check
* @return can this index be used to access a valid subsidy?
*/
static FORCEINLINE bool IsValidID(size_t index)
{
return index < Subsidy::GetArraySize() && Subsidy::Get(index)->IsValid();
}
/**
* Returns pointer to subsidy with given index
* @param index index of subsidy
* @return pointer to subsidy with given index
*/
static FORCEINLINE Subsidy *Get(size_t index)
{
assert(index < Subsidy::GetArraySize());
return &Subsidy::array[index];
}
static Subsidy *AllocateItem();
static void Clean();
};
#define FOR_ALL_SUBSIDIES_FROM(var, start) for (size_t subsidy_index = start; var = NULL, subsidy_index < Subsidy::GetArraySize(); subsidy_index++) \
if ((var = Subsidy::Get(subsidy_index))->IsValid())
#define FOR_ALL_SUBSIDIES(var) FOR_ALL_SUBSIDIES_FROM(var, 0)
#endif /* SUBSIDY_BASE_H */
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